Web feeding device



May 25, 1937. o. WOHLRABE WEB FEEDING DEVICE Original Filed May 23, 1929 \NVENTOR patented May 25,1931 I I 2,081,654

uurrao s'r 'ras PATENT OFFICE 2,081,354 wen Faanmc nsvron Otto Wohlrabe, Plauen, Germany, assignor to gel:1 Punch Company mited, London, Eng- Original application May 23, 1925, Serial No. 365,353. Divided and this application April :2, Serial No. 667,443. In Germany June 19 Clalms. (Cl. Wit-2.6) I

This invention relates to a device for the autocircumference of the cylinder. In the case of the matic feeding of a printed web tomaintain the web being fed to the product issuing from a web in perfect register, that is to say, the web press or to another element with which the web having areas of preprinted matter disposed at is to register, the-cylinder i is arranged to be regular intervals along its length is arranged to rotated in synchronism with the press or other 5 be fed under the control of the device so that the element in any convenient and obvious manner, areas of preprinted matter are maintained in regnot shown. The webis provided with a series ister with other members such as a severing knife of transparencies, such as the hole indicated at arranged to cut the web into sheets, or the web 2, Figure 1, spaced at regular intervals along the may be fed in register with other printed webs length thereof in some simple proportion to the issuing from a printing press and thereafter sevlength of the preprinted areas along the web and ered into sheets with the said other webs. The the circumference of the cylinder is also dimenfunctlon of the device according to the invention sioned in some such simple prop A P is to maintain the correct register of the preof selenium cells 50 and Si are arranged on the printed web in spite of shrinkage orexpansion of cylinder at a short distance apart, and are electhe web or other causes which tend to make the trically connected respectively to pairs of contact web run out of correct register and the above are rings 54 and 55 mounted upon and rotatable with examples of the uses to which the invention may an extension la of the cylinder I. Brushes 5M be applied. This application is a division of my and 55a are arranged in electrical contact with prior application Serial No. 365,353, filed May 23, the rings 5t and 55 and serve for operatively con- 1929, which has now matured into Letters Patent necting the device to a mechanism for controlling 1,970,352, granted August 14, 1934. the ,feed regulating motor, for example, to a sys- The principal object ofthe invention is to protem of relays as hereinafter described. Around vide a device of the above character by which that circumferential portion of the cylinder i errors in registration of a preprinted web may be occupied by the cells 50 and 5!, a hood 52 is disreadily detected by light sensitive means or other posed which is provided with inlet and outlet pasmeans responsive to variations in intensity or sages 52a and 5217 which enable the web l5 to run radiation incident thereon as the web is continuon to the cylinder through the passage 52a and ously fed and the automatic regulation of the leave it through the passage 5217. Where the web f ed ng speed of the printed web effected upon contacts with the cylinder which, in the example errors being so detected. shown, is around an angl In order that the invention may be fully undercircumference of the cylinder, stood, reference is directed to the accompanyformed into a reflecting casing in which several ing drawing, in which:-- lamps 53 are positioned. Normally when the Figure 1 i a diagrammatic plan of a, device web i5 is in correct register, the transparencies constructed in accordance with the invention 2 are located between the cells 53 and 5! when the employing light sensitive or similar cells for deweb travels around the cylinder, but if the web testing errors in registration of a continuously leads or lags from correct're end a transfed preprinted web; parency wholly or partly overlaps one of the cells,

Figure 2 is a diagrammatic cross section of the the same will be illuminated by the light from 40 device shown in Figure lthe lamps 53 and that reflected by the inner wall Figure 3 illustrates the circuit diagram of elecof the hood 52. The difference in the electrical trical relays employed for actuating the feed regresistance of the cell so illuminated produces ulating mechanism under the control of the dechange in the electrical characteristics of the vice shown in Figures 1 and2; circuit in which it is connected through the re- Figure 4 illustrates the circuit diagram of an spective contact rings and brushes and this amplifier for the impulses derived from the lightchange is caused to actuate a relay as above sensitive cells; and stated which in turn efiects an actuation of the Figure 5 illustrates diagrammatically an arfeed regulating motor for adjusting the feed of rangement for eiiecting control of the web feed. the webs. When the correct register of the web 5 Referring to the drawing, the device comprises has been restored-the transparencies are again a cylinder I over which the preprinted web is arlocated between the cells and Bi. In lieu of ranged to extend as it is continuously fed so that effecting the illumination of the cells through the preprinted matters on the web normally regperforations in the web, the difference in transister with predetermined points or areas on the parency of the printed and non-printed parts of the regulating motor, the cells, of course; being As an additional precaution for ensuring that p sitioned on the cylinder so that the said transthe correcting mechanism is rendered inoperable verse margins or other transparencies are eil'ec- If h W a th r n ilpply System ov 'tive to control them. In lieu of selenium cells, described m y e o id d W h a wi h 60 C011- whichare responsive to variations in intensity of cult with a master switch which is operatively tion of relays, the said currents may b mg n tion of the switch as described the relays 2B and fled by known means such as three electrode tubes 27 W be cut Off m ly fr m their pp y or the like. Thus each of th circuits through current in the event of the web being torn. It the light-sensitive cells so or at y be connected will be app ted a ny c e i means to the input of an amplifying device of any com may be employed to effect regulation of the web of the valve 12 includes the respective relays 26 an extended path over an adjusting roller 12 or 27, the relay 26 being shown in Figure 4, carried by an arm 13 provided on a pivotally 30 tying circuitis energized, an increase in potena worm 15 driven by a reversible motor M. The

recting mechanism. Greaterampli'flcation may direction of rotation- 40 tion. If desired, arrangements may be made to the conveyor carrying the error detecting device.

one such arrangement, the cylinder I is dimen- What I claim and desire to secure by Letters '45 sioned twice as large in diameter as the impres- Patent of the United States is:- sion cylinder employed for-printing the matter 1. Apparatus-for use in maintaining the regon the web and the cylinder I is provided with lstration of a continuously fed Dreprinted web of 30 ment for preventing the simultaneous operation diation incident thereon during the continuous of the motor. Relays 26 and 21 are connected tratlon a sly fed pf pl'ln ed web of of a three-electrode valve 12. The anode circuit 1 uid rollers 70, 7|, between which it takesv 35 f course be obtained by the use of a plurality Rotation of the motorin one direction or the relay21 is connected through the contact 61 of means and means for controlling the web to regintensity of said radiation incident thereon dur-, ing the continuous feeding of said web to originate an impulse to actuate said controlling means when the said index means and the said movable element are out of register; and means for pro-. longing the impulse over a period substantially in excess of that required for said index means to move past a fixed point at the feeding speed of the web.

3. Apparatus for use in maintaining the registration of a continuously fed preprinted web of material having index means disposed at regular intervals along the length thereof, comprising an element adapted normally to move in synchronous registration with said moving index means and means for controlling the web to register the same correctly with said element, said controlling means'including a source of radiation of which the intensity is variable by relative displacement of said element and said index means, and a device responsive to the degree. of intensity of said radiation incident thereon during the continuous feeding of said web to: produce an impulse to effect said control when the said index means and the said movable element are out of register, and impulse over a period substantially in excess of that required for said index means to move past a fixed point at the feeding speed of the web.

4. Apparatus for use in maintaining the registration of a continuously fed preprinted web of material having index means disposed at regular intervals along the length thereof, comprising an element adapted normally to move in synchronous registration with said moving index means and means for controlling the web to register the same correctly with said element, said controlling means including a source of radiation of which the intensity is variable by relative displacement of said element and said index means, and a device responsive to the degree of intensity of said radiation incident thereon during the continuous feeding of said web to originate an impulse when said index means leads or lags from correct register with said movable ele ment, a first relay responsive to said impulse when said index means leads and a second relay responsive to said impulse when said index means lags, and means for prolonging the impulse for a period substantially in excess of that necessary for said index means to pass a fixed point at the feeding speed of the we 5. Apparatus for use in maintaining the registration of a continuously fed preprinted web of material having index means disposed at regular intervals along the length thereof, comprising'an element adapted normally to move in synchronous registration with said moving index means and means for controlling'the web to register the same correctly with said element, said controlling means including a source of radiation of which the intensity is variable by relative displacement of said element and said index means, and a device responsive to the degree of intensity of said radiation incident thereon during the continuous feeding of said web to originate an impulse when said index means leads or lags from correct register with said movable element, means for amplifying said impulse, a first relay responsive to said amplified impulse when said index means leads and a second relay responsive to saidamplified impulse when said index means lags, and means for prolonging the impulse for a period substantially in excess ofthat means for prolonging the index means to pass a fixed point at the feeding speed of the web.

6. Apparatus for use in maintaining the registration of a continuously fed preprinted web of material having index means disposed at regular intervals along the length thereof, comprising an element adapted normally to move'in synchronous registration with said moving index means and means for controlling the web to register the same correctly with said element, said controlling means including ,a.source of radiation of which the intensity is variable by relative displacement required for said of 'said element and said index means, and a device responsive to the degree of intensity of said radiation incident thereon during the continuous feeding of said web to produce an impulse when said index means leads or lags from correct registration with said movable element, means for prolonging said impulse over an extended period substantially in excess of that necessary for said index means to move past a fixed point at the feeding speed of the web, a first relay responsive to said impulse when said index means leads, and a second relay responsive to said impulse when said index means lags, said relays being operable to affect said controlling means to restore the web to register.

7. Apparatusfor use in maintaining the registration of a continuously fed preprinted web of material having index means disposed at regular intervals along the length thereof, comprising an element adapted normally to move in synchronous registration with said moving index means and means for controlling the web to register the same correctly with said element, said controlling means including a source of radiation of which the intensity is variable by relative displacement of said element and said index means, and a device responsive to the degree of intensity of said radiation incident thereon during the continuous feeding of said web to produce an impulse when said index means leads or lags from correct registration with said movable element, means for prolonging said impulse over an extended period substantially in excess of that required for said index means to movepast a fixed point at the feeding speed of the web, means for amplifying said impulse, a first relay responsive to said amplified impulse when said index means leads and a second relay responsive to said amplified impulse when said index means lags, said relays being operable to affect said controlling means to restore the web to register.

8. Apparatus for use in maintaining the registration of a continuously fed preprlnted web of material having index means disposed at regular intervals along the length thereof, comprising a rotatable element adapted normally to rotate in synchronous registration with said moving index means and means for controlling the web to register the same correctly with said elment, said controlling means including a source of radiation of which the intensity is variable by relative displacement of said element and said index means, and a device responsive to the degree of intensity of said radiation incident thereon during the continuous feeding of said web to origi- Web.

. a slve to said light sensitive means -for controlling means the feeding of the 13. Apparatus for use with a high speed printing press in which a web of material having light of said index thefeedtof the web.

15. Apparatus for use withahigh speed printing press in which a web of material having index means disposed at rea'ular Intervals along the I illumination of the light ength thereof is continuously fed, comprising a :onveyor arranged to engage and travel with the web for a substantial distance, means including a light sensitive device for controlling the feed of the web to properly register the latter and a device for supplying light to said light sensitive means, at least one of the said devices being carried with said conveyor, said index means being operable on displacement thereof with respect to said conveyor to supplied to said light sensitive device during a substantial portion ofthe period of engagement of said index means and conveyor.

16. Apparatus for use with a high speed printing press in which a web of material having light cont-rolling index means disposed at regular intervals along the length thereof is continuously fed, comprising in combination, a conveyor arranged to engage and travel with theweb for a substantial distance, a light source and a light responsive device, at least one of which is carried by the conveyor, the operative association between said light source and said light responsive device being efiective over a substantial portion of said substantial distance under the control of said index means so as to vary the intensity of the light imparted to the light sensitive device from said light source in accordance with the relative position between said index means and a predetermined normal position thereof on said conveyor, and means responsive to the variation of sensitive device for registering the web by controlling the feed of the latter.

1'1. Apparatus for use with a high speed printing press in which a web of material having index means disposed at regular intervals along the length thereof is continuously fed, comprising a conveyor arranged to engage and travel with the web for a substantial distance, means including 'a light sensitive device for controlling the feed of the web to properly register the latter, and a device for supplying light to said light sensitive thereof is fed, comprising means device, at least one of the said devices being carried with said conveyor, said conveyor being provided with means arranged for registry with said index .means to vary the light supplied to said light sensitive device, and means whereby said last named means is rendered efiective during a substantial portion of the period of engagement of said index means and conveyor.

- 18. Apparatus for use with a high speed printing press in which a web of material having indexmeans disposed at regular intervals along the length thereof is continuously fed, comprising a engage and travel with the a light sensitive device for controlling the feed of the web to properly register the latter, and a device for supplying light to said light sensitive device, at least one of the said devices being carried with said conveyor, and means whereby said index means is rendered operable on displacement thereof with respect to said conveyor to vary the light supplied to said light sensitive device during a substantial portion of the period of engagement of said index means and conveyor.

19. Apparatus for use with a high speed print ing press, in which a web having preprinted matter disposed at regular intervals along the length arranged to travel with said web for a substantial distance thereof and disposed adjacent one side of the web, light sensitive means carried by said last named means, a source of light arranged on the opposite side of the web and effective over a substantial portion of said substantial distance, said web being provided at spaced intervals with portions pervious to such impulses, whereby the shifting of the web with respect to the means to control the transmission of light to said light sensitive means, and means responsive to said light sensitive means for controlling the feeding of the web.

o'rro woman. 

